Montcada i Reixac, often referred to as simply Montcada, is a municipality in the comarca of the Vallès Occidental in Catalonia, Spain. It is situated at the confluence of the Ripoll river and the Besós river, and very close to the northernmost neighbourhoods of the city of Barcelona and is therefore a part of the metropolitan area of Barcelona. It had 33,656 inhabitants according to the 2010 census.

Vallès Occidental is a comarca (county) in the Barcelona region in Catalonia (Spain). It has two capitals, Sabadell and Terrassa. Along with Vallès Oriental, it forms the historical Vallès region.